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Populus × jackii
''Populus'' × ''jackii'' (balm-of-Gilead) is the hybrid between balsam poplar, ''Populus balsamifera'', and the eastern cottonwood, ''Populus deltoides'', occurring occasionally where the two parental species' ranges overlap. It is sometimes called a cottonwood. This hybrid is also sometimes planted as a shade tree, and occasionally escapes from cultivation. This hybrid is also known by the synonyms ''Populus ''×'' andrewsii'' Sargent, ''P. ''×'' bernardii'' Boivin, ''Populus candicans'' W. Aiton, ''P. ''×'' dutillyi'' Lepage, ''P. ''×'' generosa'' Henry, ''P. ''×'' gileadensis'' Rouleau, and ''P. manitobensis'' Dode.〔(【引用サイトリンク】title=Populus X jackii Sargent )〕
The parental balsam poplar, ''P. balsamifera'', is also known as ''P. tacamahaca'' and ''P. trichocarpa,'' and is widespread in boreal North America. The name ''Populus candicans'' has been variously used for either ''P. balsamifera'' or ''P. '' × ''jackii''; it is currently considered a synonym of ''P. balsamifera.''
== Fragrant resin ==
The tree is named after the unrelated biblical Balm of Gilead, a ''Commiphora'' resin. Its leaf buds are coated with a resinous sap with a strong, pleasant turpentine or balsam odor that is most evident as the leaves unfold in the spring. For purposes of commerce, the buds are collected before they open, and can be cut up for pot-pourri or used in herbal medicine. Like other poplars, balm-of-Gilead is expected to contain salicin in its bark, and in relation to traditional herbal treatment have been regarded as antiscorbutic, antiseptic, balsamic, diuretic, expectorant, stimulant and tonic.〔(【引用サイトリンク】title=Populus x jackii - Sarg. )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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